Digital Store – Order Processing System

Overview

This project is a backend system for processing digital content orders. It handles pricing, discounts, delivery, and user management for a digital store that sells ebooks, audiobooks, physical books, and subscriptions.

Running the Project

./gradlew run

Or build and run the JAR:

./gradlew build
java -jar build/libs/digital-store-1.0-SNAPSHOT.jar

Requires JDK 17+ and Gradle.

Project Structure

src/main/kotlin/com/digitalstore/
├── Main.kt
├── model/
│   ├── User.kt
│   ├── Item.kt
│   ├── Order.kt
│   ├── DeliveryInfo.kt
│   └── OrderResult.kt
├── service/
│   ├── OrderProcessor.kt
│   ├── InventoryManager.kt
│   └── DeliveryService.kt
└── util/
    └── DataHelper.kt

Your Task

• Refactor the code to improve maintainability and readability
• Fix any bugs you find
• Make the system easier to extend with new item types or discount rules
• Improve the overall design where you see fit

Notes

• The system currently supports item types: ebook, audiobook, book, subscription
• Promo codes: SAVE10, SAVE20, FREESHIP, STUDENT15, NEWUSER
• Membership types: premium, standard, student
• Tax rates vary by country